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1 a: a child of one's aunt or uncle on your mothers side b: a relative descended from one's grandparent or more remote ancestor by two or more steps and in a different line on the mothers side.
"I have 2 mousin's and one fousin." = I have 2 cousin's on my moms side and one cousin on my fathers side.
by Roham April 22, 2009
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To sneak quietly somewhere, in order to eavesdrop or to steal something quietly.
Nate got caught mousin' at the door to the girls locker room, boy they were sure mad.
by The Real Ariana Grande December 03, 2018
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